11221210021121 has 4 divisors (see below), whose sum is σ = 11881281198852. Its totient is φ = 10561138843392.

The previous prime is 11221210021117. The next prime is 11221210021123. The reversal of 11221210021121 is 12112001212211.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5774288850625 + 5446921170496 = 2402975^2 + 2333864^2 .

It is not a de Polignac number, because 11221210021121 - 2² = 11221210021117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 660071177713 = 11221210021121 / (1 + 1 + 2 + 2 + 1 + 2 + 1 + 0 + 0 + 2 + 1 + 1 + 2 + 1).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11221210021121.

It is not an unprimeable number, because it can be changed into a prime (11221210021123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330035588840 + ... + 330035588873.

It is an arithmetic number, because the mean of its divisors is an integer number (2970320299713).

Almost surely, 2^{11221210021121} is an apocalyptic number.

It is an amenable number.

11221210021121 is a deficient number, since it is larger than the sum of its proper divisors (660071177731).

11221210021121 is an equidigital number, since it uses as much as digits as its factorization.

11221210021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660071177730.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 11221210021121 its reverse (12112001212211), we get a palindrome (23333211233332).

The spelling of 11221210021121 in words is "eleven trillion, two hundred twenty-one billion, two hundred ten million, twenty-one thousand, one hundred twenty-one".